How many days must weed be out of your system to pass a urine test?

Im on probation too with ua's. I take the biggest hit I can of 15-25% thx strains, 25 is highest in world. I get ua's every week and pass. That's about .5-.7 grams of weed on avg depending on THC level. The less fat you have the higher u get and sooner it exits system. I have 12% body fat am 15 weigh 150 and am 5 ft 4. Sooo if ur in reasonably good shape and smoke a ten of white widow. It takes 2-3 weeks to be sure it's out but can leave sooner! Tho most strains even good ones are 15% due to improper growing techniques such as wring temperature, too much or too little fert and not enough germination. But if it's a random job drug test and not court I'd say drink alot of milk with cranberry pills. Since THC is filtered by the liver and carried into the fat cells by drinking milk which is Also fat soluable you can flush it out along with cranberry pills is a perfect combo. I hate the idea of a job drug testing for weed. As long as they don't show up high, it's stupid because what people do on the weekends is their own private life with friends and shouldn't be invaded by a stupid test. Anyways hope this helps